Intact quasiparticles at an unconventional quantum critical point

  title={Intact quasiparticles at an unconventional quantum critical point},
  author={Michael L Sutherland and Eoin C. T. O’Farrell and William Henry Toews and J. L. Dunn and Kentaro Kuga and Satoru Nakatsuji and Yo Machida and Koichi Izawa and Robert W. Hill},
  journal={Physical Review B},
We report measurements of in-plane electrical and thermal transport properties in the limit T → 0 near the unconventional quantum critical point in the heavy-fermion metal β-YbAlB4. The high Kondo temperature TK � 200 K in this material allows us to probe transport extremely close to the critical point, at unusually small values of T/T K < 5 × 10 −4 . Here we find that the Wiedemann-Franz law is obeyed at the lowest temperatures, implying that the Landau quasiparticles remain intact in the… 

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Science 331
  • 316
  • 2011
  • Rev. B 89, 045130
  • 2014
  • Wirth et al., Nature (London) 484, 493
  • 2012
  • Pearson et al., Nat. Phys. 4, 603
  • 2008
Science 316
  • 1320
  • 2007
  • Jpn. 84, 024710
  • 2015
  • Jpn. 34, 639 (1973); J. A. Hertz, Phys. Rev. B 14, 1165 (1976); A. J. Millis, ibid. 48, 7183 (1993). 041114-4 RAPID COMMUNICATIONS INTACT QUASIPARTICLES AT AN UNCONVENTIONAL . . . PHYSICAL REVIEW B 92, 041114(R)
  • 2015
  • Status Solidi B 250, 425
  • 2013
  • Rev. Lett. 110, 236402
  • 2013